rfcp/desktop/main.js

const { app, BrowserWindow, ipcMain, dialog, shell } = require('electron');
const { spawn } = require('child_process');
const path = require('path');
const fs = require('fs');
const Store = require('electron-store');

const store = new Store();
let mainWindow;
let splashWindow;
let backendProcess;
let backendLogStream;

// ── Paths ──────────────────────────────────────────────────────────

const isDev = process.env.NODE_ENV === 'development';

/**
 * Get path to a bundled resource (extraResources).
 * In production, extraResources live under process.resourcesPath.
 * In dev, they live in the repo root.
 */
const getResourcePath = (...segments) => {
  if (isDev) {
    return path.join(__dirname, '..', ...segments);
  }
  return path.join(process.resourcesPath, ...segments);
};

/**
 * User data directory — writable, persists across updates.
 *   Windows:  %APPDATA%\RFCP\data\
 *   Linux:    ~/.config/RFCP/data/
 *   macOS:    ~/Library/Application Support/RFCP/data/
 */
const getDataPath = () => {
  return path.join(app.getPath('userData'), 'data');
};

/**
 * Log directory for backend output and crash logs.
 *   Windows:  %APPDATA%\RFCP\logs\
 *   Linux:    ~/.config/RFCP/logs/
 *   macOS:    ~/Library/Logs/RFCP/
 */
const getLogPath = () => {
  return app.getPath('logs');
};

/** Backend executable path */
const getBackendExePath = () => {
  const exeName = process.platform === 'win32' ? 'rfcp-server.exe' : 'rfcp-server';
  if (isDev) {
    return path.join(__dirname, '..', 'backend', exeName);
  }
  return getResourcePath('backend', exeName);
};

/** Frontend index.html path (production only) */
const getFrontendPath = () => {
  return getResourcePath('frontend', 'index.html');
};

// ── Logging ────────────────────────────────────────────────────────

function log(msg) {
  const line = `[${new Date().toISOString()}] ${msg}`;
  console.log(line);
  if (backendLogStream) {
    backendLogStream.write(line + '\n');
  }
}

function initLogFile() {
  const logDir = getLogPath();
  if (!fs.existsSync(logDir)) {
    fs.mkdirSync(logDir, { recursive: true });
  }
  const logFile = path.join(logDir, 'rfcp-main.log');
  backendLogStream = fs.createWriteStream(logFile, { flags: 'w' });
  log(`Log file: ${logFile}`);
  log(`Platform: ${process.platform}, Electron: ${process.versions.electron}`);
  log(`isDev: ${isDev}`);
  log(`userData: ${app.getPath('userData')}`);
  log(`resourcesPath: ${isDev ? '(dev mode)' : process.resourcesPath}`);
}

// ── Data directories ───────────────────────────────────────────────

function ensureDataDirs() {
  const dirs = ['terrain', 'osm', 'projects', 'cache'];
  const dataPath = getDataPath();

  dirs.forEach(dir => {
    const fullPath = path.join(dataPath, dir);
    if (!fs.existsSync(fullPath)) {
      fs.mkdirSync(fullPath, { recursive: true });
    }
  });

  log(`Data path: ${dataPath}`);
  return dataPath;
}

// ── Splash window ──────────────────────────────────────────────────

function createSplashWindow() {
  splashWindow = new BrowserWindow({
    width: 400,
    height: 300,
    frame: false,
    transparent: true,
    alwaysOnTop: true,
    resizable: false,
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false
    }
  });

  splashWindow.loadFile(path.join(__dirname, 'splash.html'));
  splashWindow.center();
}

// ── Backend lifecycle ──────────────────────────────────────────────

async function startBackend() {
  const dataPath = ensureDataDirs();
  const logDir = getLogPath();

  // SQLite URL — normalize to forward slashes for cross-platform compatibility
  const dbPath = path.join(dataPath, 'rfcp.db').replace(/\\/g, '/');

  const env = {
    ...process.env,
    RFCP_DATA_PATH: dataPath,
    RFCP_DATABASE_URL: `sqlite:///${dbPath}`,
    RFCP_HOST: '127.0.0.1',
    RFCP_PORT: '8888',
    RFCP_LOG_PATH: logDir,
  };

  if (isDev) {
    const pythonCmd = process.platform === 'win32' ? 'python' : 'python3';
    const backendCwd = path.join(__dirname, '..', 'backend');
    log(`Starting dev backend: ${pythonCmd} -m uvicorn ... (cwd: ${backendCwd})`);

    backendProcess = spawn(pythonCmd, [
      '-m', 'uvicorn',
      'app.main:app',
      '--host', '127.0.0.1',
      '--port', '8888',
      '--reload'
    ], {
      cwd: backendCwd,
      env,
      stdio: ['ignore', 'pipe', 'pipe']
    });
  } else {
    const backendExe = getBackendExePath();
    const backendDir = path.dirname(backendExe);
    log(`Starting production backend: ${backendExe}`);
    log(`Backend cwd: ${backendDir}`);

    // Verify the exe exists
    if (!fs.existsSync(backendExe)) {
      log(`FATAL: Backend exe not found at ${backendExe}`);
      return false;
    }

    // Make executable on Unix
    if (process.platform !== 'win32') {
      try {
        fs.chmodSync(backendExe, '755');
      } catch (e) {
        log(`chmod warning: ${e.message}`);
      }
    }

    backendProcess = spawn(backendExe, [], {
      cwd: backendDir,
      env,
      stdio: ['ignore', 'pipe', 'pipe']
    });
  }

  // Pipe backend output to log
  const backendLogFile = path.join(logDir, 'rfcp-backend.log');
  const backendLog = fs.createWriteStream(backendLogFile, { flags: 'w' });

  backendProcess.stdout?.on('data', (data) => {
    const text = data.toString().trim();
    log(`[Backend] ${text}`);
    backendLog.write(text + '\n');
  });

  backendProcess.stderr?.on('data', (data) => {
    const text = data.toString().trim();
    log(`[Backend:err] ${text}`);
    backendLog.write(`[err] ${text}\n`);
  });

  backendProcess.on('error', (err) => {
    log(`Failed to start backend: ${err.message}`);
    dialog.showErrorBox('Backend Error', `Failed to start backend: ${err.message}`);
  });

  backendProcess.on('exit', (code, signal) => {
    log(`Backend exited: code=${code}, signal=${signal}`);
  });

  // Wait for backend to be ready
  return new Promise((resolve) => {
    const maxAttempts = 60;  // 30 seconds
    let attempts = 0;

    const checkBackend = setInterval(async () => {
      attempts++;

      try {
        const response = await fetch('http://127.0.0.1:8888/api/health/');
        if (response.ok) {
          clearInterval(checkBackend);
          log(`Backend ready after ${attempts * 0.5}s`);
          resolve(true);
        }
      } catch (_e) {
        // Not ready yet
      }

      if (attempts >= maxAttempts) {
        clearInterval(checkBackend);
        log('Backend failed to start within 30s');
        resolve(false);
      }
    }, 500);
  });
}

// ── Main window ────────────────────────────────────────────────────

function createMainWindow() {
  const windowState = store.get('windowState', {
    width: 1400,
    height: 900
  });

  mainWindow = new BrowserWindow({
    width: windowState.width,
    height: windowState.height,
    x: windowState.x,
    y: windowState.y,
    minWidth: 1024,
    minHeight: 768,
    show: false,
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      preload: path.join(__dirname, 'preload.js')
    },
    title: 'RFCP - RF Coverage Planner',
    titleBarStyle: process.platform === 'darwin' ? 'hiddenInset' : 'default',
  });

  // Save window state on close
  mainWindow.on('close', () => {
    const bounds = mainWindow.getBounds();
    store.set('windowState', bounds);
  });

  // Load frontend
  if (isDev) {
    log('Loading frontend from dev server: http://localhost:5173');
    mainWindow.loadURL('http://localhost:5173');
    mainWindow.webContents.openDevTools();
  } else {
    const frontendIndex = getFrontendPath();
    log(`Loading frontend from: ${frontendIndex}`);

    if (!fs.existsSync(frontendIndex)) {
      log(`FATAL: Frontend not found at ${frontendIndex}`);
      dialog.showErrorBox('Startup Error', `Frontend not found at:\n${frontendIndex}`);
      app.quit();
      return;
    }

    mainWindow.loadFile(frontendIndex);
  }

  mainWindow.once('ready-to-show', () => {
    if (splashWindow) {
      splashWindow.close();
      splashWindow = null;
    }
    mainWindow.show();
  });

  mainWindow.on('closed', () => {
    mainWindow = null;
  });

  // Handle external links
  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url);
    return { action: 'deny' };
  });
}

// ── App lifecycle ──────────────────────────────────────────────────

app.whenReady().then(async () => {
  initLogFile();
  createSplashWindow();

  const backendStarted = await startBackend();

  if (!backendStarted) {
    const logDir = getLogPath();
    const result = await dialog.showMessageBox({
      type: 'error',
      title: 'Startup Error',
      message: 'Failed to start backend server.',
      detail: `Check logs at:\n${logDir}\n\nClick "Show Logs" to open the folder.`,
      buttons: ['Quit', 'Show Logs']
    });

    if (result.response === 1) {
      shell.openPath(logDir);
    }

    app.quit();
    return;
  }

  createMainWindow();
});

app.on('window-all-closed', () => {
  if (backendProcess) {
    backendProcess.kill();
    backendProcess = null;
  }

  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', () => {
  if (mainWindow === null) {
    createMainWindow();
  }
});

app.on('before-quit', () => {
  if (backendProcess) {
    backendProcess.kill();
  }
  if (backendLogStream) {
    backendLogStream.end();
  }
});

// ── IPC Handlers ───────────────────────────────────────────────────

ipcMain.handle('get-data-path', () => getDataPath());
ipcMain.handle('get-log-path', () => getLogPath());
ipcMain.handle('get-app-version', () => app.getVersion());
ipcMain.handle('get-platform', () => process.platform);

ipcMain.handle('get-gpu-info', async () => {
  // TODO: Implement GPU detection
  return {
    available: false,
    name: null,
    cudaVersion: null
  };
});

ipcMain.handle('select-directory', async () => {
  const result = await dialog.showOpenDialog(mainWindow, {
    properties: ['openDirectory']
  });
  return result.filePaths[0] || null;
});

ipcMain.handle('select-file', async (_event, options) => {
  const result = await dialog.showOpenDialog(mainWindow, {
    properties: ['openFile'],
    filters: options?.filters || []
  });
  return result.filePaths[0] || null;
});

ipcMain.handle('save-file', async (_event, options) => {
  const result = await dialog.showSaveDialog(mainWindow, {
    defaultPath: options?.defaultPath,
    filters: options?.filters || []
  });
  return result.filePath || null;
});

ipcMain.handle('get-setting', (_event, key) => store.get(key));
ipcMain.handle('set-setting', (_event, key, value) => store.set(key, value));

ipcMain.handle('open-external', (_event, url) => shell.openExternal(url));
ipcMain.handle('open-path', (_event, filePath) => shell.openPath(filePath));